[Rd] documentation for diff (PR#1185)

[pgilbert@bank-banque-canada.ca]

The documentation for diff says:


     If `x' is a vector of length `n' and `differences=1', then the
     computed result is equal to the successive differences
     `x[(1:n-lag)] - x[(lag:n)]'. ...

This last line should say:

     `x[(1+lag):n] - x[1:(n-lag)]'.

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